<template>
  <div>
    <el-container>
      <el-header>tlias智能学习辅助系统
      </el-header>
      <el-container>
        <el-aside width="200px">
          <el-aside width="200px" style="background-color: rgb(238, 241, 246)">
            <el-menu :default-openeds="['1', '3']">
              <el-submenu index="1">
                <template slot="title"><i class="el-icon-message"></i>导航一</template>
                <el-menu-item-group>
                  <el-menu-item index="1-1">选项1</el-menu-item>
                  <el-menu-item index="1-2">选项2</el-menu-item>
                </el-menu-item-group>
              </el-submenu>
            </el-menu>
          </el-aside>
          <el-main>Main</el-main>

        </el-aside>
        <el-main>Main</el-main>
      </el-container>
    </el-container>
  </div>
</template>
<style>
.el-header {
  background-color: #B3C0D1;
  color: #333;
  text-align: center;
  line-height: 60px;
}

.el-aside {
  background-color: #D3DCE6;
  color: #333;
  text-align: center;
  line-height: 200px;
}

.el-main {
  background-color: #E9EEF3;
  color: #333;
  text-align: center;
  line-height: 160px;
}
</style>
<script>

</script>